BMI Calculator
Body mass index and WHO category from height and weight.
WHO categories (kg/m²)
- < 18.5 — Underweight
- 18.5–24.9 — Normal
- 25–29.9 — Overweight
- 30–34.9 — Obese I
- 35–39.9 — Obese II
- ≥ 40 — Obese III
Body Mass Index
24.5
kg/m²
Category
Normal weight
BMI does not distinguish muscle from fat and is one factor among many in surgical candidacy and risk. Education only — follow local protocol.
Body Mass Index (BMI)
BMI is weight divided by height squared (kg/m²) and gives a quick, standardised estimate of weight status. It is widely used as one input to surgical candidacy and peri-operative risk.
WHO categories
Underweight < 18.5, normal 18.5–24.9, overweight 25–29.9, and obesity class I (30–34.9), II (35–39.9) and III (≥ 40).
BMI in plastic surgery
Many procedures (e.g. body contouring, abdominoplasty) use BMI thresholds for safety and outcome; BMI is one factor alongside comorbidity, distribution of fat and patient goals.
Education only — BMI does not distinguish muscle from fat; follow local protocol and clinical judgement.